Index: trunk/ppSim/src/ppSimInsertStars.c
===================================================================
--- trunk/ppSim/src/ppSimInsertStars.c	(revision 16496)
+++ trunk/ppSim/src/ppSimInsertStars.c	(revision 17557)
@@ -27,6 +27,7 @@
     psMetadata *recipe = psMetadataLookupMetadata(NULL, config->recipes, PPSIM_RECIPE); // Recipe
 
-    float expTime = psMetadataLookupF32(NULL, config->arguments, "EXPTIME"); // Exposure time
-    float darkRate = psMetadataLookupF32(NULL, config->arguments, "DARK.RATE"); // Dark rate
+    float expTime   = psMetadataLookupF32(NULL, recipe, "EXPTIME"); // Exposure time
+    float darkRate  = psMetadataLookupF32(NULL, recipe, "DARK.RATE"); // Dark rate
+
     float readnoise = psMetadataLookupF32(NULL, cell->concepts, "CELL.READNOISE");// CCD read noise, e
     if (isnan(readnoise)) {
@@ -39,10 +40,10 @@
     }
 
-    float skyRate = psMetadataLookupF32(NULL, config->arguments, "SKY.RATE"); // Sky rate
+    float skyRate = psMetadataLookupF32(NULL, recipe, "SKY.RATE"); // Sky rate
     if (isnan(skyRate)) {
-	float zp      = psMetadataLookupF32(&mdok, config->arguments, "ZEROPOINT"); assert (mdok);
-	float scale   = psMetadataLookupF32(&mdok, config->arguments, "SCALE");     assert (mdok);
-	float skyMags = psMetadataLookupF32(&mdok, config->arguments, "SKY.MAGS");  assert (mdok);
-	skyRate = scale * scale * pow (10.0, -0.4*(skyMags - zp));
+	float zp      = psMetadataLookupF32(&mdok, recipe, "ZEROPOINT"); assert (mdok);
+	float scale   = psMetadataLookupF32(&mdok, recipe, "SCALE");     assert (mdok);
+	float skyMags = psMetadataLookupF32(&mdok, recipe, "SKY.MAGS");  assert (mdok);
+        skyRate = scale * scale * ppSimMagToFlux (skyMags, zp);
     }